Hi,
it seems that nobody signed to this list (especially developers) after
developers were divided in two groups
(FFmpeg and forked Libav)... I can not see archives of this mail-list while
developers' thread is worked well...
Then somewhere I found a hint to compile with "--enable-pthreads" instead of
> "w32threads".
> So I got myself the pthreads-win32 library source.
>
I tried to get multithreading decoding to work last days and was confused
that it really works only with
pthreads flag and doesn't - with w32threads! I had not found any description
of this in documentation.
Now I get it worked! I cross-compile FFmpeg too from Linux (because doing
that from MSYS is sucks)
but I didn't compile pthreads - I get it from external repository as
mingw32- and mingw-w64- tools.
Maybe we should share our DLL libraries to check that them built well...
Now if I leave "codec->thread_count" on 1 it still works (single threaded)
> but if I set it to values > 1 then in case of mp4 or xvid videos
> "avcodec_decode_video2" returns 0 and *got_picture_ptr is also 0.
>
I have no such problems. I replace the old libraries with new ones and code
works fine. But I use deprecated avcodec_decode_video() function and I setup
multithreading like this:
int threadsCount = StThread::countLogicalProcessors();
codecCtx->thread_count = threadsCount;
avcodec_thread_init(codecCtx, threadsCount);
ST_DEBUG_LOG("FFmpeg: Setup AVcodec to use " + threadsCount + "
threads");
// open VIDEO codec
if(avcodec_open(codecCtx, codec) < 0) {...
not sure that avcodec_thread_init() call is needed at all - I read somewhere
that it was deprecated now.
How is multithreaded decoding supposed to work? do I have to provide
> "codec->execute" or "codec->execute2"?
>
I didn't do something like this...
Is there some known bug or something?
>
All I found is a multithreading.txt file. But after experimental
multithreading branch was integrated into main repository
I suppose that some new BUGs could be found...
On which codecs should multithreaded decoding work?
>
I don't know. But for x264/h264 it works.
-----------------------------------------------
Kirill Gavrilov,
Software designer.
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